package com.yan.config;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * HandlerInterceptor  导入拦截器的注解
 */

public class MyInterceptor implements HandlerInterceptor {

    /**
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     *
     *   return false  在开始就拦截了  不执行下一个拦截器
     *
     *     return true 执行下一个拦截器 放行
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("处理前=================");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("处理后=============可以加写日志====");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("清理===========可以加写日志======");
    }
}
